TXT is a DNS record, which contains information in human-readable form for external sources to obtain info about a certain domain name or subdomain. In the most common scenario, this kind of record is employed to prove that you own a domain in case you're trying to add it to a search engine or to some site traffic analytics platform. Considering that only the domain name owner/administrator may add custom DNS records, the TXT record works as a proof of ownership for the firm supplying the service. Another popular use for this sort of records is the e-mail SPF (Sender Policy Framework) security, that ensures that an e-mail address won't be spoofed and that others will not get spam from allegedly your mailbox. The TXT record contains info about the mail server where your online messages originate from and functions as verification that it is a trusted one. Because there are no rules regarding the content of this kind of a record, you can add any other info as well.